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M5 x 0.8 threaded bolts... Are there no standards?

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M5 x 0.8 threaded bolts... Are there no standards?

Old 12-22-18, 10:48 PM
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It is important to read the fine print in the E-Bay ad that I linked above.
Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid.
It makes one wonder what will really be in the box when it arrives.
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Old 12-23-18, 07:21 AM
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Originally Posted by CliffordK
It is important to read the fine print in the E-Bay ad that I linked above.
Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid.
It makes one wonder what will really be in the box when it arrives.
I'll bet it has more to do with some people measuring thread length v/s total length (including head), and some people measuring with a carpenters tape (which side of the tab?) v/s a machinist rule v/s micrometer. All the different combinations of the above...Getting a return eBay complaint for a made up or dumb reason on the buyers part must suck for eBay sellers.
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Old 12-23-18, 08:30 AM
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Originally Posted by base2
I'll bet it has more to do with some people measuring thread length v/s total length (including head), and some people measuring with a carpenters tape (which side of the tab?) v/s a machinist rule v/s micrometer. All the different combinations of the above...Getting a return eBay complaint for a made up or dumb reason on the buyers part must suck for eBay sellers.
I doubt they hand measure any bolts, except during setup and QA/QC. They could count quantities in a package.

I was thinking that was a standard disclaimer from stuff like bar tape, perhaps ribbons.

But, you're probably right, easiest to fudge the sizes a bit than dealing with complaints.
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Old 12-23-18, 09:56 AM
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Lately the box stores Homedepot, Lowes and Menards have had a fairly good selection. The ACE and ACO near me have closed long ago. But the norm for me is Westmarine and Suburban Nut and Bolt (all fasteners) but thatís in the Detroit area. In the off hours itís the box stores....

Standards? Thread pitch and hole size... just say various materials...and engineers (that think something needs just a little bit more shoulder... but not that much!!) lmao
Yes, 😔 im a design engineer.. lol

Cheers, Tony
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Old 12-23-18, 10:19 AM
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Sure there are standards. It's normal for button head, low profile and flat head bolts to have a smaller wrench size than a socket head.
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Old 12-23-18, 01:21 PM
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with a 5mm bolt of any given style of head, there are only so many sizes of hex wrench that would fit. I'm sure someone has tried to establish a standard, but if so, they failed. Same is true with SAE threaded hardware. At one job, we had a bin with 10-32 socket head cap screws where there were two different size hex wrenches needed depending on which bolt you grabbed.
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